.loading-heartbeat {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  opacity: 0;
  background: #fff;
  display: none;
  pointer-events: none;

  &--active {
    display: block;
    animation-name: heartbeat;
    animation-duration: 2s;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
  }
}

@keyframes heartbeat {
  0% { opacity: 0.2; }
  50% { opacity: 1; }
  100% { opacity: 0.2; }
}
